Try to keep the these two seams very straight. Otherwise we’ll create a wavy look where the lighter and darker color fabric is sewn together.

Use a pair of scissors or rotary cutter and cut between your stitched lines on the diagonal line.

Open our newly created triangles to form a 3 1/2 inch half square triangle.

Press the seams either open or to the dark side. If you plan to press them open use a shorter stitch length of 1.2 to 1.5 to increase the stitches strength.

After you have arranged your half square triangles and squares into the 6 rows and 6 columns that form the gretchen quilt block pattern. It’s time to start sewing the pieces together.

You can sew them together in many different ways, but it’s suggested you sew only one quadrant together at a time.

As you sew the rows together you may want to pin the pieces together. This help keep everything lined up when it’s time to sew the quadrants together.

All the pieces and rows should be sewn together using a scant quarter inch seam allowance.